From [1]}, there is a MSS
\(\lbrace E_r^{s, t, \ast }, d_r\rbrace \) 
which converges to \({\rm Ext}_A^{s, t}(\mathbb {Z}_p, \mathbb {Z}_p)\) 
with \(E_1\) -term
\(E_1^{\ast , \ast , \ast }= E(h_{m, i}|m>0, i\ge 0)\otimes P(b_{m,i}|m>0, i\ge 0)\otimes P(a_n|n\ge 0),\) 
